ASTRONOMY COLLOQUIUM

In the last decade, there has been tremendous progress in understanding the overall evolution of the interstellar gas in galaxies and the processes leading to stars (and planetary system formation). From observations of nearby galaxies we gain insightinto star formation processes, while from comprehensive surveys out to redshift ~ 6 (and some detections at z > 10), we now have a quantitative picture of the earlycosmic evolution of interstellar gas. Despite the great observational progress, there isa diversity of understanding. I will highlight those issues where recognizing a few paradoxes can lead to surprising but fundamental understanding – e.g. the role of spiral structure, the trigger of star cluster formation, the lifetimes of molecular clouds and the role of atomic gas. Lastly, some open discussion of Pop III star formation atredshift 20 – 30. The talk will be interactive.